He was busy writing a story, only ______ once in a while to smoke a cigarette.
A．to stopB．stoppingC．to have stoppedD．having stopped
B
句意：他忙著編故事，偶爾停下來吸只煙。此題容易錯(cuò)選A。但only to do 表結(jié)果，人、而根據(jù)題意可知，此處表伴隨且stop 幾乎與was busy 同時(shí)發(fā)生，故用B，而having stopped 表示此動(dòng)作限于謂語動(dòng)詞發(fā)生，與題意明顯不符。
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